Truss



June 2, 1925. 1,540,593 r J. s. BIRCH TRUSS Filed June 1. 1923 2 Sheets-Sheet l WIT/7555755 June 2, 1925.

J. S. .BlRCH muss Patented June 2, 1925.

PATENT caries;

JAMEs s. BIRCH, OF'CHICAGO, ILLINOIS.

TRUSS.

Application filed June 1,

To all whom may, concern:

Be it known that I, Janus S. Enron, a citizen of the United bt'ates, residing at Chicago, in the county of Cook and State oi Illinois, have invented certainnew and useful Improvements in a Truss, or" which the following is a specification.

This invention relates to apparatus for use in connection with concrete and cement work and the primary object of the inven' tion is to provide an improved truss for supporting an overhead concrete fOF'IIl of pan for effectively holding the same in an operative position until the; concrete or cement sets.

Another prime object of the invention is to provide an improved truss for supporting a concrete former pan, which can be readily and quickly taken apart or set up for storing or use and which can be adjusted to suit varying conditions of the wo-ik being done. 7

A further prime object of the invention is to provide an improved truss of the above character, which will be durable and cient in use, one that will besimple-and easy to manufacture and one which can be placed upon the market at a reasonable cost and used over again.

Vith these and other objects in view, the invention consists in the novel construction, arrangement and formation ofparts, as will be hereinafter more specifically described, claimed and illustrated in the accompanying. drawings in which drawings Figure 1 is a side elevation of the improved truss showing the same in its operative position.

Figure 2 is a top plan View of the same.

Figure 3 is a transverse vertical section oi the improved truss taken on: the line 33 of Figure 1.

Figure 4 is a vertical transverse section through the improved truss taken on the line l-i of Figure 1.

Figure 5 is a fragmentary longitudinal section through the improved truss taken on the line 55 of Figure 2.

Figure 6 is a detail transverse section taken on the line 66 of Figure 1.

Figure 7 is a detail perspective view of one of the truss rods.

Figure 8 is a detail perspective view of one of the connecting and binding members.

Referring to the drawing in detail, where ing supporting plates 35 and '36.

1923. Serial No. 642,842.

in similar reference. characters designate corresponding parts throughoutthe several views, the letter A generally indicates the improved truss utilized for supporting the pans, which embodies the upper platform section 10. This section 10 includes a pair of spaced supporting beams 11 and 12 of the desired length and crossse'ction, the tor-l minalsof which are adaptedito rest upon the upper surface of supporting bars 13 and ll, which can be in the nature of four by four'posts' if so desired- As shown these posts of the supporting members 13 and 14: are placed in engagement with the side portions ofthe building constructio-n15 and 16, which can be considered in the nature of columns, girders or walls.

Disposed below the top structure or platform 10 is the weight distributing platform or lower structure which also embodies a pair of spaced beams 21 and 22. The upper and lower structures 10 and 20 are connected together by a pairot inner compression members 25 and 26 and by an outer pair of compression membersv 27 and 28.

The inner pair of truss or compression mem bers 25 and 26 include upper and lower transversely extending rests 80', which are connected by the vertically extending truss bars 31. These bars 31 are secured to the upper and'lower members in any preferred way. In orderto prevent longitudi- The outer pairvof compression members 2'7 and 28 also include transversely extend- These outer pair of compression members 27 and 28 are also held in place by suitable U- shaped fasteners 38.

-A- center pair of diagonally. extending cross tension rods 40' are provided for bracing, the truss and the terminals of these tension rods are bent back upon themselves to provide elongated terminals 41 which re ceive the connecting or bite portions of the U-shaped upper and lower clamps 32 and 33. As shown the terminal loops 41 extend between the beams 11 and 12 of the upper structure 10 and between the beams 21 and 22 of the lower weight distributing structure 20.

Oppositely extending end tension bars 42 and 43 are provided for further bracing the structure and as shown these tension rods 43 and 42 are also provided with elongated terminal loops 44. The lower terminal loops 44 receive the bite or connecting portions of the ,U-shaped clamps or holding members 38 and these loops extend between the beams 21 and 22 of the lower structure 20. The upper terminal loops of the tension rods 42 and 43 extend between the beams 11 and 12 of the upper structure 20 and receive the bite or connecting portions of the depending U-shaped clamping members 45 which embrace the beams 11 and 12, on the upper supporting structure 10 adjacent to the terminals thereof. The depending legs of the U-shaped clamping members 45 receive transversely extending holding plates which are adapted to be nailed or otherwise temporarily secured to the supporting posts 13 and 14 to prevent displacement of the truss, when the same is placed in position.

By this construction it can be seen that an exceptionally simple and durable truss has been provided upon which can be placed the ordinary pan or form for receiving the concrete or cement during the forming of an arch or a floor. The improved truss can be readily taken apart to permit the same to be easily transported from one'place to another and this is accomplished by simply removing the U-shaped clamping members 32, 33, 38 and 45 and the tension members 40, 42 and 43. V

The improved truss can also be adjusted to suit varying conditions, and it can be seen that different sized compression members 25, 26, 27 and 28 can be used. The truss can be made in different lengths by substituting differentlengths of beams for the beams 11 and 12, or these beams 11 and 12 can be slid in relation to one another.

Changes in details may be made without departing from the spirit or the scope of this invention.

Vhat I claim as new is:

1. A truss for concrete work comprising a spaced pair of bridge beams, a pair of spaced lower weight distributing beams, compression truss disposed between the bridge beams and the weight distributing beams and engaging the inner surfaces thereof, removable U-shape'd connecting members detachably holding the compression members in engagement with the bridge beams and with the weight distributing beams, and diagonally extending tension rods connected with said compression members.

- 2. A truss for concrete work comprising a pair of longitudinally extending spaced bridge beams, a pair of lower spaced longitudinally extending weight distributing beams,

outer compression members disposed between the bridge beams and the weight distributing beams, depending U-shaped connecting tral pair of diagonally extending cross tension rods connected with said inner men tioned connecting members.

3. A truss for concrete work comprising a pair of upper bridge beams disposed in spaced relation, a pair of lower weight distributing beams arranged in spaced relation, compression members disposed between the bridge beams and the weight distributing beams, removable U-shaped connecting members embracing the bridge beams and the weight distributing beams for supporting said compression members, a pair of cross diagonally extending tension rods, elongated loops formed on the terminals of the rods and disposed between the pairs of bridge beams and weight distributing beams and receiving said connecting members, transversely extending attaching blocks disposed adjacent to the terminals of the bridge beams, depending U-shaped connecting members embracing the bridge beams and receiving said attaching blocks and oppositely extending tension bars extending from the compression members to the outer ends 2 In testimony whereof I atiix my signature in presence of two witnesses.

' JAMES S. BIRCH.

Witnesses LoNNIE B. OoULTEn, Rnnn B. VVnLLs.

Ill) 

